The Three Gorges Project is the largest multi-purpose hydro-development project ever built in China and so in the world. The re-verification on TGP undertaken by 412 Chinese experts from 1986 to 1989, laid the foundation for the execution of the project construction. Since 1993, the construction has been commenced and proceeded smoothly according to the approved general schedule. The project investment is well controlled within the approved estimates of the preliminary design. The quality of the work already completed is satisfactory to the design requirements. Several important conclusions drawn from the re-verification have been proved preliminarily to be correct. And a series of major technical challenges, such as river closure of the grand channel, the construction of the deen water cofferdam, the excavation stability of the permanent ship lock with high slope, and the extremely high intensive concrete placement, have been met. The practice has fully proved the necessity and correctness of the previous scientific verification.